1 College of Surveying and Geo-Informatics,Shandong Jianzhu University,Jinan 250101,Shandong; 2 School of Civil Engineering,Shandong Jianzhu University,Jinan 250101,Shandong
Abstract：Tancheng Maipo is named as a typical site of the seismic active fault,in which the most eye-catching sign is that the purple-gray Lower Cretaceous of the east-wall thrust up to the red-brown Quaternary of the west-wall of the second trunk fault(F2)of Tanlu Fault Zone,and the boundary is very clear. The field investigation and the test analysis showed that some earthquake-induced soft sediment deformation structures developed in the Quaternary Yuquan Formation of Tancheng Maipo,including liquefied sand flow pipes,liquefied sand veins,seismic fissure-filling structures,syn-sedimentary faults and other deformation, which were seismic event records. According to the OSL analysis of sandy clay in the soft sediment deformation structures,it is affirmed that the seismic events recorded by these soft sediment deformation structures should belong to strong tectonic seismic activities of the second trunk fault F2 during the late stage of the Mid-Pleistocene in Tanlu Fault Zone. These seismic event records not only provide new data for new tectonic movements and seismic activities in the Tanlu Fault Zone,but also enrich geoscience connotations of the seismic active fault site.
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